lt250dave

Has this happened to anyone else with a Baja?

P.S.,,,,,This thread will not be a spot for brand "X" RC owners to trash talk. It will be reported if this happens.

BuggZy99

My Feedback: (2)

wow !!! ive had that happened but to my FG truck.

pilotjohn

The new driveshafts that HPI are making should take care of the pin moving problem.

bigger the better

I don't think thats abnormal. I have also broken one in my FGMT, I know its not the same brand but, I think brand makes no difference here, its a week spot on these types of outdrives.

Apache-

Remember a drive shaft is something that wears down in time.
When you keep on the gas while landing something like this can occur.

Another possible reason is when the dogbone got jammed while suspension is travelling further. Then this can crack the wheel shaft or the output shaft on the diff.

When it would be a manufacturing failure more people would suffer/report this problem.

bigger the better

Oh ya, try to send them in for a replacement, it worked for me! I did'nt wait for them to come in thou, I have two sets now.[:@]

lt250dave

if you notice in the second pic, there is no sign of wear on the drive cup so i dont believe it broke from excessive use/wear. i am pretty sure it broke because the pins worked their way out of the dog bone and caused it to bind during the suspension movement.

After seeing what the left side bone looked like, i took the right side off to inspect it but it looks fine.

Acs_guitars

My Feedback: (3)

Hpi will more than likely replace them as long as you don't mention the 29cc or the reed set-up.... That extra torque is definitely what did it. I have an FG, but it took 2 years for the drive cup to split, and only after a few hard landings that day did that happen. I would bet that a stock BAJA drive cup would have no issues over the same time on a stock set-up so I am not bragging on my brand "X" car . On mine I am waiting for Hellya to get in some ball drives, but I don't think you have that option yet.

lt250dave

i understand what you mean about "stock" engine power. but i still cant figure out what caused the pins to back out of the dog bone

Apache-

Decent ball drives take more abuse than the dogbones, that is is true, but not available as far as I know for the baja.
Just check the pins regulary and you should be fine.

pilotjohn

Yes once the pin moved enough to not engage in the drive cup slot, all the pressure is on one side and no drive cup can handle the forces. The new driveshafts are going to hold the pins better so they wont move. If the pin didn't move the drive cup would not have broke.

Acs_guitars

My Feedback: (3)

The Firehammers have had this problem too. Duratrax evidently told someone in an e-mail that they needed to solder the pins in on new dogbones before use. Some simply pinched the center on the pin and re-inserted it, while others tried red lock tite. I don't know which worked best, but both will work.
I would try sending those in to HPI as well.

hndaman1

My Feedback: (6)

I was told that buy customer support at Duratrash on my 1 month old FH I even bought new drive shafts from tower and I could pull the pins right out with a pliers[X(] and Duratrash thought there wasn't a problem[sm=spinnyeyes.gif] They said I had too solder them befor I used them.......I went too ball drives after that on My 29cckitted FH and on my stocker FH,either way I do not have either anymore

jeepfreak1972

Some of the first run Baja's had problems with the pins sliding out because they had the hole oversized. As far as we know those were few and far between. As far as the drive cup goes, broke them one on my Fg and I'm sure I will brake them on my Baja too. I like to fly you know.[sm=tongue_smile.gif]

hndaman1

My Feedback: (6)

We know,I seen it in the great Video that keeps getting DELETED[:@][:@]

lt250dave

[link]http://www.hpiracing.com/products/en/86610.html[/link]

hopefully i can find a set of these soon and they will cure my problem for a little while. If i'm real lucky HPI CS will send me a set

lt250dave

Well i got in touch with Wes at HPI CS today and he told me the drive axle problem i have isnt a common problem with the Baja but he had plenty in stock so he sent me new drive axles, dog bones and rubber dust covers. this 2 year warranty ROCKS [sm=shades_smile.gif]

bigger the better

Sounds like these two guys may of done the same?[&o]
http://media.putfile.com/baja-91
http://media.putfile.com/Baja-Buggy

lt250dave

mine break was almost identical to the first vid, i hit a lame little jump and then it revved to the moon.

hellya

Dog bones only provide a 2 point contact within the output cups, 50/50 stress creating the L shape in the cup or splitting it in 1/2.

Ball drives offer 3 point contact or 33.33% stress at each point, distributing the torque more evenly inside the output cup


Hpi needs to come up with some ball drives............IMO

Apache-

That is how it often goes with a part that brakes down.
Silly - slow - movements and ........ BANG.

What people tend to forget is all the abuse it took before when it held up.
It is just a sum that adds up and at a certain point "the bucket is full and floods" as we say here.
This goes for every car.

lt250dave

dont get me wrong my Baja has seen more than its share of WOT landings from as much as eight feet in the air in one of the local gravel pits my buddy and i bash at and it has taken the beatings in stride, No broken A-arms, No blown out shocks, No stripped spur gear. the only things that have really broke was the steering servo which they sent a new one for free and the drive axle which they are sending new dogbones, drive axles, and rubber boots for free. Also Wes confirmed that the pin working its way out of the dog bone is what broke the drive axle.

Gary_C

dave, i broke the diff shaft after only one tank of gas on a bone stock motor. It looked like an imperfection in the material the way it snapped. These shafts are hardened and tempered and done in mass production so i think there may be a few with metallurgical imperfections.

BuggZy99

My Feedback: (2)

hmmm, thats weird,i thought, according to a few members that breaking was only for the FG
i wonder if a ball drive sstem will be available for these soon.

Timmahh

theres a few that have had issues. i broke a pin in the shaft, nib broke both his. we both on new replacement sets without issue.


my new all steel drive shafts will be here tomorrow!

Timmahh